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</style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr /><td align="left" valign="top" width="32"><img align="left" border="0" height="32" src="images/rb-logo.png" width="32" /></td><td width="1">&#160;&#160;</td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a>&#160;&#183; <a href="classes.html"><font color="#004faf">All Classes</font></a>&#160;&#183; <a href="modules.html"><font color="#004faf">Modules</font></a></td></table><h1 align="center">QDesignerPropertySheetExtension Class Reference<br /><sup><sup>[<a href="qtdesigner.html">QtDesigner</a> module]</sup></sup></h1><p>The QDesignerPropertySheetExtension class allows you to
manipulate a widget's properties which is displayed in Qt
Designer's property editor. <a href="#details">More...</a></p>

<p>Inherited by <a href="qpydesignerpropertysheetextension.html">QPyDesignerPropertySheetExtension</a>.</p><h3>Methods</h3><ul><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#QDesignerPropertySheetExtension">__init__</a></b> (<i>self</i>)</li><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#QDesignerPropertySheetExtension-2">__init__</a></b> (<i>self</i>, QDesignerPropertySheetExtension)</li><li><div class="fn" />int <b><a href="qdesignerpropertysheetextension.html#count">count</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="qdesignerpropertysheetextension.html#hasReset">hasReset</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />int <b><a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a></b> (<i>self</i>, QString&#160;<i>name</i>)</li><li><div class="fn" />bool <b><a href="qdesignerpropertysheetextension.html#isAttribute">isAttribute</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />bool <b><a href="qdesignerpropertysheetextension.html#isChanged">isChanged</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />bool <b><a href="qdesignerpropertysheetextension.html#isVisible">isVisible</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />QVariant <b><a href="qdesignerpropertysheetextension.html#property">property</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />QString <b><a href="qdesignerpropertysheetextension.html#propertyGroup">propertyGroup</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />QString <b><a href="qdesignerpropertysheetextension.html#propertyName">propertyName</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" />bool <b><a href="qdesignerpropertysheetextension.html#reset">reset</a></b> (<i>self</i>, int&#160;<i>index</i>)</li><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#setAttribute">setAttribute</a></b> (<i>self</i>, int&#160;<i>index</i>, bool&#160;<i>b</i>)</li><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#setChanged">setChanged</a></b> (<i>self</i>, int&#160;<i>index</i>, bool&#160;<i>changed</i>)</li><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#setProperty">setProperty</a></b> (<i>self</i>, int&#160;<i>index</i>, QVariant&#160;<i>value</i>)</li><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#setPropertyGroup">setPropertyGroup</a></b> (<i>self</i>, int&#160;<i>index</i>, QString&#160;<i>group</i>)</li><li><div class="fn" /><b><a href="qdesignerpropertysheetextension.html#setVisible">setVisible</a></b> (<i>self</i>, int&#160;<i>index</i>, bool&#160;<i>b</i>)</li></ul><h3>Special Methods</h3><ul><li><div class="fn" /> <b><a href="qdesignerpropertysheetextension.html#__len__">__len__</a></b> (<i>self</i>)</li></ul><a name="details" /><hr /><h2>Detailed Description</h2><p>The QDesignerPropertySheetExtension class allows you to
manipulate a widget's properties which is displayed in Qt
Designer's property editor.</p>
<p>QDesignerPropertySheetExtension provides a collection of
functions that are typically used to query a widget's properties,
and to manipulate the properties' appearance in the property
editor. For example:</p>
<pre class="cpp">
 <span class="type">QDesignerPropertySheetExtension</span> <span class="operator">*</span>propertySheet  <span class="operator">=</span> <span class="number">0</span>;
 <span class="type"><a href="qextensionmanager.html">QExtensionManager</a></span> manager <span class="operator">=</span> formEditor<span class="operator">-</span><span class="operator">&gt;</span>extensionManager();

 propertySheet <span class="operator">=</span> qt_extension<span class="operator">&lt;</span><span class="type">QDesignerPropertySheetExtension</span><span class="operator">*</span><span class="operator">&gt;</span>(manager<span class="operator">,</span> widget);
 <span class="type">int</span> index <span class="operator">=</span> propertySheet<span class="operator">-</span><span class="operator">&gt;</span><a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>(QLatin1String(<span class="string">"margin"</span>));

 propertySheet<span class="operator">-</span><span class="operator">&gt;</span><a href="qdesignerpropertysheetextension.html#setProperty">setProperty</a>(index<span class="operator">,</span> <span class="number">10</span>);
 propertySheet<span class="operator">-</span><span class="operator">&gt;</span><a href="qdesignerpropertysheetextension.html#setChanged">setChanged</a>(index<span class="operator">,</span> <span class="keyword">true</span>);

 <span class="keyword">delete</span> propertySheet;
</pre>
<p>Note that if you change the value of a property using the
<a href="qdesignerpropertysheetextension.html#setProperty">QDesignerPropertySheetExtension.setProperty</a>()
function, the undo stack is not updated. To ensure that a
property's value can be reverted using the undo stack, you must use
the <a href="qdesignerformwindowcursorinterface.html#setProperty">QDesignerFormWindowCursorInterface.setProperty</a>()
function, or its buddy <a href="qdesignerformwindowcursorinterface.html#setWidgetProperty">setWidgetProperty()</a>,
instead.</p>
<p>When implementing a custom widget plugin, a pointer to <i>Qt
Designer</i>'s current <a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a>
object (<tt>formEditor</tt> in the example above) is provided by
the <a href="qdesignercustomwidgetinterface.html#initialize">QDesignerCustomWidgetInterface.initialize</a>()
function's parameter.</p>
<p>The property sheet, or any other extension, can be retrieved by
querying <i>Qt Designer</i>'s extension manager using the <a href="qextensionmanager.html#qt_extension">qt_extension</a>() function.
When you want to release the extension, you only need to delete the
pointer.</p>
<p>All widgets have a default property sheet which populates <i>Qt
Designer</i>'s property editor with the widget's properties (i.e
the ones defined with the <a href="qobject.html#Q_PROPERTY">Q_PROPERTY</a>() macro). But
QDesignerPropertySheetExtension also provides an interface for
creating custom property sheet extensions.</p>
<p><b>Warning:</b> <i>Qt Designer</i> uses the
QDesignerPropertySheetExtension to feed its property editor.
Whenever a widget is selected in its workspace, <i>Qt Designer</i>
will query for the widget's property sheet extension. If the
selected widget has an implemented property sheet extension, this
extension will override the default property sheet.</p>
<p>To create a property sheet extension, your extension class must
inherit from both <a href="qobject.html">QObject</a> and
QDesignerPropertySheetExtension. Then, since we are implementing an
interface, we must ensure that it's made known to the meta object
system using the <a href="qobject.html#Q_INTERFACES">Q_INTERFACES</a>() macro:</p>
<pre class="cpp">
 <span class="keyword">class</span> MyPropertySheetExtension : <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span><span class="operator">,</span>
         <span class="keyword">public</span> <span class="type">QDesignerPropertySheetExtension</span>
 {
     Q_OBJECT
     Q_INTERFACES(<span class="type">QDesignerPropertySheetExtension</span>)

 <span class="keyword">public</span>:
     <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
 }
</pre>
<p>This enables <i>Qt Designer</i> to use <a href="qobject.html#qobject_cast">qobject_cast</a>() to query for
supported interfaces using nothing but a <a href="qobject.html">QObject</a> pointer.</p>
<p>In <i>Qt Designer</i> the extensions are not created until they
are required. For that reason, when implementing a property sheet
extension, you must also create a <a href="qextensionfactory.html">QExtensionFactory</a>, i.e a class that is
able to make an instance of your extension, and register it using
<i>Qt Designer</i>'s <a href="qextensionmanager.html">extension
manager</a>.</p>
<p>When a property sheet extension is required, <i>Qt
Designer</i>'s <a href="qextensionmanager.html">extension
manager</a> will run through all its registered factories calling
<a href="qextensionfactory.html#createExtension">QExtensionFactory.createExtension</a>()
for each until the first one that is able to create a property
sheet extension for the selected widget, is found. This factory
will then make an instance of the extension. If no such factory can
be found, <i>Qt Designer</i> will use the default property
sheet.</p>
<p>There are four available types of extensions in <i>Qt
Designer</i>: <a href="qdesignercontainerextension.html">QDesignerContainerExtension</a>,
<a href="qdesignermembersheetextension.html">QDesignerMemberSheetExtension</a>,
QDesignerPropertySheetExtension and <a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a>.
Qt Designer's behavior is the same whether the requested extension
is associated with a multi page container, a member sheet, a
property sheet or a task menu.</p>
<p>The <a href="qextensionfactory.html">QExtensionFactory</a> class
provides a standard extension factory, and can also be used as an
interface for custom extension factories. You can either create a
new <a href="qextensionfactory.html">QExtensionFactory</a> and
reimplement the <a href="qextensionfactory.html#createExtension">QExtensionFactory.createExtension</a>()
function. For example:</p>
<pre class="cpp">
 <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>ANewExtensionFactory<span class="operator">.</span>createExtension(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>object<span class="operator">,</span>
         <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>iid<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent) <span class="keyword">const</span>
 {
     <span class="keyword">if</span> (iid <span class="operator">!</span><span class="operator">=</span> Q_TYPEID(<span class="type">QDesignerPropertySheetExtension</span>))
         <span class="keyword">return</span> <span class="number">0</span>;

     <span class="keyword">if</span> (MyCustomWidget <span class="operator">*</span>widget <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MyCustomWidget<span class="operator">*</span><span class="operator">&gt;</span>
            (object))
         <span class="keyword">return</span> <span class="keyword">new</span> MyPropertySheetExtension(widget<span class="operator">,</span> parent);

     <span class="keyword">return</span> <span class="number">0</span>;
 }
</pre>
<p>Or you can use an existing factory, expanding the <a href="qextensionfactory.html#createExtension">QExtensionFactory.createExtension</a>()
function to make the factory able to create a property sheet
extension extension as well. For example:</p>
<pre class="cpp">
 <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>AGeneralExtensionFactory<span class="operator">.</span>createExtension(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>object<span class="operator">,</span>
         <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>iid<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent) <span class="keyword">const</span>
 {
     MyCustomWidget <span class="operator">*</span>widget <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MyCustomWidget<span class="operator">*</span><span class="operator">&gt;</span>(object);

     <span class="keyword">if</span> (widget <span class="operator">&amp;</span><span class="operator">&amp;</span> (iid <span class="operator">=</span><span class="operator">=</span> Q_TYPEID(<span class="type"><a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a></span>))) {
         <span class="keyword">return</span> <span class="keyword">new</span> MyTaskMenuExtension(widget<span class="operator">,</span> parent);

     } <span class="keyword">else</span> <span class="keyword">if</span> (widget <span class="operator">&amp;</span><span class="operator">&amp;</span> (iid <span class="operator">=</span><span class="operator">=</span> Q_TYPEID(<span class="type">QDesignerPropertySheetExtension</span>))) {
         <span class="keyword">return</span> <span class="keyword">new</span> MyPropertySheetExtension(widget<span class="operator">,</span> parent);

     } <span class="keyword">else</span> {
         <span class="keyword">return</span> <span class="number">0</span>;
     }
 }
</pre>
<p>For a complete example using an extension class, see the
<a href="designer-taskmenuextension.html">Task Menu Extension
example</a>. The example shows how to create a custom widget plugin
for Qt Designer, and how to to use the <a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a>
class to add custom items to <i>Qt Designer</i>'s task menu.</p>
<hr /><h2>Method Documentation</h2><h3 class="fn"><a name="QDesignerPropertySheetExtension" />QDesignerPropertySheetExtension.__init__ (<i>self</i>)</h3><h3 class="fn"><a name="QDesignerPropertySheetExtension-2" />QDesignerPropertySheetExtension.__init__ (<i>self</i>, <a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a>)</h3><h3 class="fn"><a name="count" />int QDesignerPropertySheetExtension.count (<i>self</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns the selected widget's number of properties.</p>


<h3 class="fn"><a name="hasReset" />bool QDesignerPropertySheetExtension.hasReset (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns true if the property at the given <i>index</i> has a
reset button in <i>Qt Designer</i>'s property editor, otherwise
false.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#reset">reset</a>().</p>


<h3 class="fn"><a name="indexOf" />int QDesignerPropertySheetExtension.indexOf (<i>self</i>, QString&#160;<i>name</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns the index for a given property <i>name</i>.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#propertyName">propertyName</a>().</p>


<h3 class="fn"><a name="isAttribute" />bool QDesignerPropertySheetExtension.isAttribute (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns true if the property at the given <i>index</i> is an
attribute, which will be <i>excluded</i> from the UI file,
otherwise false.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#setAttribute">setAttribute</a>().</p>


<h3 class="fn"><a name="isChanged" />bool QDesignerPropertySheetExtension.isChanged (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns true if the value of the property at the given
<i>index</i> differs from the property's default value, otherwise
false.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>(),
<a href="qdesignerpropertysheetextension.html#setChanged">setChanged</a>(),
and <a href="qdesignerpropertysheetextension.html#reset">reset</a>().</p>


<h3 class="fn"><a name="isVisible" />bool QDesignerPropertySheetExtension.isVisible (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns true if the property at the given <i>index</i> is
visible in <i>Qt Designer</i>'s property editor, otherwise
false.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#setVisible">setVisible</a>().</p>


<h3 class="fn"><a name="property" />QVariant QDesignerPropertySheetExtension.property (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns the value of the property at the given <i>index</i>.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>(),
<a href="qdesignerpropertysheetextension.html#setProperty">setProperty</a>(),
and <a href="qdesignerpropertysheetextension.html#propertyGroup">propertyGroup</a>().</p>


<h3 class="fn"><a name="propertyGroup" />QString QDesignerPropertySheetExtension.propertyGroup (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns the property group for the property at the given
<i>index</i>.</p>
<p><i>Qt Designer</i>'s property editor supports property groups,
i.e. sections of related properties. A property can be related to a
group using the <a href="qdesignerpropertysheetextension.html#setPropertyGroup">setPropertyGroup</a>()
function. The default group of any property is the name of the
class that defines it. For example, the <a href="qobject.html#objectName-prop">QObject.objectName</a> property
appears within the <a href="qobject.html">QObject</a> property
group.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#setPropertyGroup">setPropertyGroup</a>().</p>


<h3 class="fn"><a name="propertyName" />QString QDesignerPropertySheetExtension.propertyName (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Returns the name of the property at the given <i>index</i>.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>().</p>


<h3 class="fn"><a name="reset" />bool QDesignerPropertySheetExtension.reset (<i>self</i>, int&#160;<i>index</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Resets the value of the property at the given <i>index</i>, to
the default value. Returns true if a default value could be found,
otherwise false.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>(),
<a href="qdesignerpropertysheetextension.html#hasReset">hasReset</a>(), and
<a href="qdesignerpropertysheetextension.html#isChanged">isChanged</a>().</p>


<h3 class="fn"><a name="setAttribute" />QDesignerPropertySheetExtension.setAttribute (<i>self</i>, int&#160;<i>index</i>, bool&#160;<i>b</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>If <i>attribute</i> is true, the property at the given
<i>index</i> is made an attribute which will be <i>excluded</i>
from the UI file; otherwise it will be included.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#isAttribute">isAttribute</a>().</p>


<h3 class="fn"><a name="setChanged" />QDesignerPropertySheetExtension.setChanged (<i>self</i>, int&#160;<i>index</i>, bool&#160;<i>changed</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Sets whether the property at the given <i>index</i> is different
from its default value, or not, depending on the <i>changed</i>
parameter.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#isChanged">isChanged</a>().</p>


<h3 class="fn"><a name="setProperty" />QDesignerPropertySheetExtension.setProperty (<i>self</i>, int&#160;<i>index</i>, QVariant&#160;<i>value</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Sets the <i>value</i> of the property at the given
<i>index</i>.</p>
<p><b>Warning:</b> If you change the value of a property using this
function, the undo stack is not updated. To ensure that a
property's value can be reverted using the undo stack, you must use
the <a href="qdesignerformwindowcursorinterface.html#setProperty">QDesignerFormWindowCursorInterface.setProperty</a>()
function, or its buddy <a href="qdesignerformwindowcursorinterface.html#setWidgetProperty">setWidgetProperty()</a>,
instead.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>(),
<a href="qdesignerpropertysheetextension.html#property">property</a>(), and
<a href="qdesignerpropertysheetextension.html#propertyGroup">propertyGroup</a>().</p>


<h3 class="fn"><a name="setPropertyGroup" />QDesignerPropertySheetExtension.setPropertyGroup (<i>self</i>, int&#160;<i>index</i>, QString&#160;<i>group</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>Sets the property group for the property at the given
<i>index</i> to <i>group</i>.</p>
<p>Relating a property to a group makes it appear within that
group's section in the property editor. The default property group
of any property is the name of the class that defines it. For
example, the <a href="qobject.html#objectName-prop">QObject.objectName</a> property
appears within the <a href="qobject.html">QObject</a> property
group.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>(),
<a href="qdesignerpropertysheetextension.html#property">property</a>(), and
<a href="qdesignerpropertysheetextension.html#propertyGroup">propertyGroup</a>().</p>


<h3 class="fn"><a name="setVisible" />QDesignerPropertySheetExtension.setVisible (<i>self</i>, int&#160;<i>index</i>, bool&#160;<i>b</i>)</h3><p>This method is abstract and should be reimplemented in any sub-class.</p><p>If <i>visible</i> is true, the property at the given
<i>index</i> is visible in <i>Qt Designer</i>'s property editor;
otherwise the property is hidden.</p>
<p><b>See also</b> <a href="qdesignerpropertysheetextension.html#indexOf">indexOf</a>() and
<a href="qdesignerpropertysheetextension.html#isVisible">isVisible</a>().</p>
<h3 class="fn"><a name="__len__" /> QDesignerPropertySheetExtension.__len__ (<i>self</i>)</h3><address><hr /><div align="center"><table border="0" cellspacing="0" width="100%"><tr class="address"><td align="left" width="25%">PyQt&#160;snapshot-4.9.5-9eb6aac99275 for X11</td><td align="center" width="50%">Copyright &#169; <a href="http://www.riverbankcomputing.com">Riverbank&#160;Computing&#160;Ltd</a> and <a href="http://www.qtsoftware.com">Nokia</a> 2012</td><td align="right" width="25%">Qt&#160;4.8.3</td></tr></table></div></address></body></html>